:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1d1f21;
  --muted: #5f6368;
  --line: #e2e0d9;
  --accent: #0f6b5c;
  --accent-soft: #e3f1ee;
  --warn-soft: #fbf1dc;
  --warn: #8a5a00;
  --code-bg: #f0efe9;
  --radius: 10px;
  --measure: 720px;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --surface: #1d2024;
    --text: #e8e6e1;
    --muted: #a3a6ab;
    --line: #30343a;
    --accent: #5cc4b0;
    --accent-soft: #1d3632;
    --warn-soft: #3a3020;
    --warn: #f0c36b;
    --code-bg: #24282d;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  font-size: 16px;
  letter-spacing: 0.02em;
}
a { color: var(--accent); text-underline-offset: 3px; }
img { max-width: 100%; height: auto; border-radius: 6px; }

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 16px; }

.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 20px; padding-top: 14px; padding-bottom: 14px; }
.site-title { font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.site-header nav { display: flex; gap: 16px; flex-wrap: wrap; font-size: 0.88rem; }
.site-header nav a { color: var(--muted); text-decoration: none; }
.site-header nav a:hover { color: var(--accent); }

main { padding-top: 28px; padding-bottom: 56px; min-height: 60vh; }

.hero p { font-size: 1.05rem; color: var(--muted); margin: 0 0 24px; }
.list-heading { font-size: 1.5rem; margin: 0 0 20px; }

.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.card a {
  display: block; padding: 18px 20px; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
  text-decoration: none; color: var(--text); transition: border-color .15s;
}
.card a:hover { border-color: var(--accent); }
.card-meta { display: flex; gap: 10px; align-items: center; font-size: 0.8rem; color: var(--muted); }
.card-title { display: block; font-weight: 700; font-size: 1.08rem; line-height: 1.55; margin-top: 6px; }
.card-desc { display: block; font-size: 0.9rem; color: var(--muted); margin-top: 4px; line-height: 1.7; }

.chip { display: inline-block; font-size: 0.75rem; padding: 1px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); text-decoration: none; }
.chip-draft { background: var(--warn-soft); color: var(--warn); }

.pager { display: flex; justify-content: space-between; margin-top: 28px; }

.pr-notice {
  font-size: 0.82rem; color: var(--muted); background: var(--surface);
  border: 1px solid var(--line); border-radius: 6px; padding: 6px 12px; margin: 0 0 18px;
}
.draft-banner { background: var(--warn-soft); color: var(--warn); padding: 8px 12px; border-radius: 6px; font-weight: 700; }
.prose p.todo { background: var(--warn-soft); color: var(--warn); border-left: 4px solid var(--warn); padding: 8px 12px; border-radius: 4px; font-weight: 600; }

.post-header h1 { font-size: 1.7rem; line-height: 1.45; margin: 8px 0 24px; letter-spacing: 0.01em; }
.post-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; font-size: 0.82rem; color: var(--muted); margin: 0; }

.toc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 20px; margin-bottom: 32px; font-size: 0.92rem; }
.toc-title { font-weight: 700; margin: 0 0 6px; }
.toc ol { margin: 0; padding-left: 1.3em; }
.toc .toc-l3 { list-style: none; margin-left: 0.6em; font-size: 0.88rem; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--accent); }

.prose h2 { font-size: 1.35rem; line-height: 1.5; margin: 2.4em 0 0.8em; padding-bottom: 8px; border-bottom: 2px solid var(--line); }
.prose h3 { font-size: 1.12rem; margin: 2em 0 0.6em; padding-left: 10px; border-left: 4px solid var(--accent); }
.prose h4 { font-size: 1rem; margin: 1.6em 0 0.4em; }
.prose p { margin: 0 0 1.3em; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.3em; }
.prose li { margin: 0.25em 0; }
.prose blockquote { margin: 0 0 1.3em; padding: 4px 16px; border-left: 3px solid var(--line); color: var(--muted); }
.prose code { background: var(--code-bg); padding: 0.1em 0.4em; border-radius: 4px; font-size: 0.9em; }
.prose pre { background: var(--code-bg); padding: 14px 16px; border-radius: 8px; overflow-x: auto; line-height: 1.6; }
.prose pre code { background: none; padding: 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.4em 0; }

.table-wrap { overflow-x: auto; margin: 0 0 1.4em; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.9rem; background: var(--surface); }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; }
.prose th { background: var(--accent-soft); white-space: nowrap; }

.box { border-radius: var(--radius); padding: 14px 18px; margin: 0 0 1.4em; background: var(--surface); border: 1px solid var(--line); }
.box > :last-child { margin-bottom: 0; }
.box-title { font-weight: 700; margin: 0 0 6px !important; }
.box-note { background: var(--accent-soft); border-color: transparent; }
.box-warn { background: var(--warn-soft); border-color: transparent; }
.box-point { border: 2px solid var(--accent); }

.related { margin-top: 48px; }
.related h2 { font-size: 1.1rem; }

.site-footer { border-top: 1px solid var(--line); padding: 24px 0 32px; font-size: 0.82rem; color: var(--muted); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 8px; }
.site-footer a { color: var(--muted); }

@media (max-width: 520px) {
  body { font-size: 15.5px; }
  .post-header h1 { font-size: 1.4rem; }
  .prose h2 { font-size: 1.2rem; }
}